<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name" style="width: 400px"/>
      </el-form-item>
      <!-- 讲师头像 -->
      <el-form-item label="讲师头像">

        <!-- 头衔缩略图 -->
        <pan-thumb :image="teacher.avatar"/>
        <!-- 文件上传按钮 -->
        <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像
        </el-button>

        <!--
    v-show：是否显示上传组件
    :key：类似于id，如果一个页面多个图片上传控件，可以做区分
    :url：后台上传的url地址
    @close：关闭上传组件
    @crop-upload-success：上传成功后的回调
    <input type="file" name="file"/>
    -->
        <image-cropper
          v-show="imagecropperShow"
          :width="100"
          :height="100"
          :key="imagecropperKey"
          :url="BASE_API+'eduoss/fileoss'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"/>

      </el-form-item>
      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" :min="0" :max="100"/>
      </el-form-item>
      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <!--
            数据类型一定要和取出的json中的一致，否则没法回填
            因此，这里value使用动态绑定的值，保证其数据类型是number
          -->
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>
      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>
      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>


<script>
  import teacher from '@/api/edu/teacher'
  import ImageCropper from '@/components/ImageCropper' //上传头像组件
  import PanThumb from '@/components/PanThumb'  //上传头像组件

  const defaultForm = {
    name: '',
    sort: 0,
    level: '',
    career: '',
    intro: '',
    avatar: process.env.OSS_PATH+"/avatar/default.png"
  }

  export default {
    components:{ImageCropper,PanThumb},
    data() {
      return {
        teacher: defaultForm,
        imagecropperShow: false, //上传头像是否显示
        imagecropperKey : 0,  //上传头像key 唯一标识
        BASE_API: process.env.BASE_API,//获取dev.env.js中的BASE_API
        saveBtnDisabled: false // 保存按钮是否禁用,
      }
    }, watch: {
      //监听路由变化
      $route(to, from) {
        console.log('watch $route')
        this.init()
      }
    }, created() {
      console.log(this.BASE_API)
      this.init()
    },
    methods: {
      init() {
        if (this.$route.params && this.$route.params.id) {
          const id = this.$route.params.id
          this.getDataById(id)
        } else {
          // 使用对象拓展运算符，拷贝对象，而不是引用，
          // 否则新增一条记录后，defaultForm就变成了之前新增的teacher的值
          this.teacher = { ...defaultForm }
        }
      },
      //保存或更新
      saveOrUpdate() {
        this.saveBtnDisabled = true
        if (!this.teacher.id) {
          this.saveData()
        } else {
          this.updateData()
        }

      },
      // 保存
      saveData() {
        teacher.save(this.teacher).then(response => {
          return this.$message({
            type: 'success',
            message: '保存成功!'
          })
        }).then(resposne => {
          this.$router.push({ path: '/teacher' })
        }).catch((response) => {
          // console.log(response)
          this.$message({
            type: 'error',
            message: '保存失败'
          })
        })
      },
      //根据id获取教师信息
      getDataById(id) {
        teacher.getById(id).then(response => {
          this.teacher = response.data
        }).catch((response) => {
          this.$message({
            type: 'error',
            message: '获取数据失败'
          })
        })
      },
      // 根据id更新记录
      updateData() {
        this.saveBtnDisabled = true
        teacher.updateById(this.teacher).then(response => {
          return this.$message({
            type: 'success',
            message: '修改成功!'
          })
        }).then(resposne => {
          this.$router.push({ path: '/teacher' })
        }).catch((response) => {
          // console.log(response)
          this.$message({
            type: 'error',
            message: '保存失败'
          })
        })
      },
      //关闭上传弹窗方法
      close(){
        this.imagecropperShow=false;
        // 上传失败后，重新打开上传组件时初始化组件，否则显示上一次的上传结果
        this.imagecropperKey=this.imagecropperKey+1;
      },
      //上传成功的回调方法
      cropSuccess(data){
        console.log(data)
        this.imagecropperShow=false;

        this.teacher.avatar=data.url;
        // 上传失败后，重新打开上传组件时初始化组件，否则显示上一次的上传结果
        this.imagecropperKey=this.imagecropperKey+1;

      }
    }
  }
</script>

<style scoped>

</style>
